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nbd: trace long NBD operations

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At the moment there are 2 sources of lengthy operations if configured:
* open connection, which could retry inside and
* reconnect of already opened connection
These operations could be quite lengthy and cumbersome to catch thus
it would be quite natural to add trace points for them.

This patch is based on the original downstream work made by Vladimir.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Eric Blake <eblake@redhat.com>
CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Hanna Reitz <hreitz@redhat.com>
CC: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
This commit is contained in:
Denis V. Lunev 2022-05-30 12:39:29 +02:00 committed by Vladimir Sementsov-Ogievskiy
parent 9d05a87b77
commit 8bb100c9e2
4 changed files with 12 additions and 1 deletions
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6
block/nbd.c
View file

@ -371,6 +371,7 @@ static bool nbd_client_connecting(BDRVNBDState *s)
/* Called with s->requests_lock taken. */
static coroutine_fn void nbd_reconnect_attempt(BDRVNBDState *s)
{
int ret;
bool blocking = s->state == NBD_CLIENT_CONNECTING_WAIT;
/*
@ -380,6 +381,8 @@ static coroutine_fn void nbd_reconnect_attempt(BDRVNBDState *s)
assert(nbd_client_connecting(s));
assert(s->in_flight == 1);
trace_nbd_reconnect_attempt(s->bs->in_flight);
if (blocking && !s->reconnect_delay_timer) {
/*
* It's the first reconnect attempt after switching to
@ -401,7 +404,8 @@ static coroutine_fn void nbd_reconnect_attempt(BDRVNBDState *s)
}
qemu_mutex_unlock(&s->requests_lock);
nbd_co_do_establish_connection(s->bs, blocking, NULL);
ret = nbd_co_do_establish_connection(s->bs, blocking, NULL);
trace_nbd_reconnect_attempt_result(ret, s->bs->in_flight);
qemu_mutex_lock(&s->requests_lock);
/*

2
block/trace-events
View file

@ -172,6 +172,8 @@ nbd_read_reply_entry_fail(int ret, const char *err) "ret = %d, err: %s"
nbd_co_request_fail(uint64_t from, uint32_t len, uint64_t handle, uint16_t flags, uint16_t type, const char *name, int ret, const char *err) "Request failed { .from = %" PRIu64", .len = %" PRIu32 ", .handle = %" PRIu64 ", .flags = 0x%" PRIx16 ", .type = %" PRIu16 " (%s) } ret = %d, err: %s"
nbd_client_handshake(const char *export_name) "export '%s'"
nbd_client_handshake_success(const char *export_name) "export '%s'"
nbd_reconnect_attempt(unsigned in_flight) "in_flight %u"
nbd_reconnect_attempt_result(int ret, unsigned in_flight) "ret %d in_flight %u"
# ssh.c
ssh_restart_coroutine(void *co) "co=%p"

2
nbd/client-connection.c
View file

@ -23,6 +23,7 @@
*/
#include "qemu/osdep.h"
#include "trace.h"
#include "block/nbd.h"
@ -210,6 +211,7 @@ static void *connect_thread_func(void *opaque)
object_unref(OBJECT(conn->sioc));
conn->sioc = NULL;
if (conn->do_retry && !conn->detached) {
trace_nbd_connect_thread_sleep(timeout);
qemu_mutex_unlock(&conn->mutex);
sleep(timeout);

3
nbd/trace-events
View file

@ -73,3 +73,6 @@ nbd_co_receive_request_decode_type(uint64_t handle, uint16_t type, const char *n
nbd_co_receive_request_payload_received(uint64_t handle, uint32_t len) "Payload received: handle = %" PRIu64 ", len = %" PRIu32
nbd_co_receive_align_compliance(const char *op, uint64_t from, uint32_t len, uint32_t align) "client sent non-compliant unaligned %s request: from=0x%" PRIx64 ", len=0x%" PRIx32 ", align=0x%" PRIx32
nbd_trip(void) "Reading request"
# client-connection.c
nbd_connect_thread_sleep(uint64_t timeout) "timeout %" PRIu64